Dartmouth Castle, Devon, UK

Dartmouth Castle is one of a pair of forts, the other being
Kingswear Castle, that guard the mouth of the Dart Estuary in Devon, England.

A small fortalice was built in 1388 under the
direction of John Hawley. The present Guntower building is the earliest surviving
English coastal fortress specifically built to carry guns. It was built by the
corporation of Dartmouth between 1481 and 1495 and additions, including
open-air gun platforms, were made during the 16th century by Henry VIII and
again in the 17th century in order to accommodate new military technology.